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Title: Bubble departure in the direct-contact boiling field with a continuous liquid-liquid interface

Abstract

Behavior of vapor bubbles was experimentally investigated in the boiling field where a volatile liquid layer of per-fluorocarbon PF5050 (boiling point 306K) was directly in contact with an immiscible hot liquid layer of water above it. Heat was supplied to the continuous liquid-liquid interface by the impingement of the downward hot water jet. Vapor bubbles were generated not only from this continuous interface but from a large number of PF5050 droplets floating on it. According to precise observation, incipience of boiling did not occur at the liquid-liquid interface but in the PF5050 liquid close to the interface in both cases of continuous and dispersed interfaces. As a result, the bubbles broke up the thin PF5050 liquid film above them and rose up into the water layer. This bubble departure phenomenon, which does not occur in the ordinary pool boiling field on the solid heating wall, is very important to evaluate the heat transfer performance in the present direct-contact boiling system. For modeling this behavior, sizes of the bubbles were measured at the moment just after they were released into the water pool. Volumes of the bubbles were larger in the case of departing from the continuous liquid-liquid interface than frommore » the droplets. This tendency could be explained by taking into account the buoyancy force acting on unit area of the thin PF5050 liquid film above the bubble before departure, which was one of the most important parameters for the liquid film breakdown. (author)« less

Authors:
 [1]
  1. Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki 305-8569 (Japan)
Publication Date:
OSTI Identifier:
20829601
Resource Type:
Journal Article
Resource Relation:
Journal Name: Experimental Thermal and Fluid Science; Journal Volume: 31; Journal Issue: 3; Other Information: Elsevier Ltd. All rights reserved
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; WASTE HEAT UTILIZATION; LIQUIDS; INTERFACES; BUBBLES; ORGANIC FLUORINE COMPOUNDS; HOT WATER; DROPLETS; POOL BOILING; SIZE; HEAT EXCHANGERS; THERMAL EFFLUENTS

Citation Formats

Kadoguchi, Katsuhiko. Bubble departure in the direct-contact boiling field with a continuous liquid-liquid interface. United States: N. p., 2007. Web. doi:10.1016/J.EXPTHERMFLUSCI.2006.04.001.
Kadoguchi, Katsuhiko. Bubble departure in the direct-contact boiling field with a continuous liquid-liquid interface. United States. doi:10.1016/J.EXPTHERMFLUSCI.2006.04.001.
Kadoguchi, Katsuhiko. Mon . "Bubble departure in the direct-contact boiling field with a continuous liquid-liquid interface". United States. doi:10.1016/J.EXPTHERMFLUSCI.2006.04.001.
@article{osti_20829601,
title = {Bubble departure in the direct-contact boiling field with a continuous liquid-liquid interface},
author = {Kadoguchi, Katsuhiko},
abstractNote = {Behavior of vapor bubbles was experimentally investigated in the boiling field where a volatile liquid layer of per-fluorocarbon PF5050 (boiling point 306K) was directly in contact with an immiscible hot liquid layer of water above it. Heat was supplied to the continuous liquid-liquid interface by the impingement of the downward hot water jet. Vapor bubbles were generated not only from this continuous interface but from a large number of PF5050 droplets floating on it. According to precise observation, incipience of boiling did not occur at the liquid-liquid interface but in the PF5050 liquid close to the interface in both cases of continuous and dispersed interfaces. As a result, the bubbles broke up the thin PF5050 liquid film above them and rose up into the water layer. This bubble departure phenomenon, which does not occur in the ordinary pool boiling field on the solid heating wall, is very important to evaluate the heat transfer performance in the present direct-contact boiling system. For modeling this behavior, sizes of the bubbles were measured at the moment just after they were released into the water pool. Volumes of the bubbles were larger in the case of departing from the continuous liquid-liquid interface than from the droplets. This tendency could be explained by taking into account the buoyancy force acting on unit area of the thin PF5050 liquid film above the bubble before departure, which was one of the most important parameters for the liquid film breakdown. (author)},
doi = {10.1016/J.EXPTHERMFLUSCI.2006.04.001},
journal = {Experimental Thermal and Fluid Science},
number = 3,
volume = 31,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}